分子筛吸附剂对不同类型柴油吸附分离性能的研究

doi:10.19964/j.issn.1006-4990.2023-0272

Abstract

Abstract:

The molecular sieve adsorbent was prepared by using ion exchange method，the characterization results of the molecular sieve adsorbent showed that，the pore structure of molecular sieve adsorbents was mainly composed of intracrystalline micropores and intergranular mesopores，with the characteristics of high crystallinity，uniform grain distribution，and synergistic effect of weak and strong acids.Different types of diesel oil were used as raw materials of adsorption，the desorption agent was a lightweight desorption agent（with a boiling point lower than diesel），by using the simulated moving bed，investigating on the adsorption and separation performance of molecular sieve adsorbents for different types of diesel fuels.The result showed that，when the adsorption temperature was 120 ℃ and the pressure was 1.2 MPa，reflux ratio of adsorption zone was 0.5~1.5，reflux ratio of refining zone was 0.2~1.5，reflux ratio of desorption zone was 2.0~6.0，reflux ratio of isolation zone was -2~0，molecular sieve adsorbents operated stably under different types of diesel adsorption-desorption systems，the aromatics content of the aromatics product was more than 95％，non-aromatic content of non-aromatic product was more than 95％.Sulfur and nitrogen content，distillation range light and heavy and hydrocarbon composition in different types of diesel oil had no effect on separation purity.The higher the aromatics content in different types of diesel fuel，the higher volume ratio of desorption agent to diesel fuel.Under simulated industrial application conditions，the molecular sieve adsorbent run stably for over 600 d.Therefore，it could be seen that molecular sieve adsorbents had the characteristics of high aromatics selectivity，large adsorption capacity，and high operational stability.

Key words: diesel, molecular sieve adsorbent, desorption agent, simulated moving bed, adsorptive separation

CLC Number:

TQ127.2

ZHAO Chuang, CHEN Zihao, ZHANG Boyu, LI Ben, JIN Fengying, LI Bin, SUN Zhenhai, GUO Chunlei. Study on adsorption and separation performance of molecular sieve adsorbents for different types of diesel[J]. Inorganic Chemicals Industry, 2024, 56(3): 80-85.

Figures/Tables 13

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References 12

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项目	密度/ （g·cm^-3）	硫含量/ （μg·g^-1）	氮含量/ （μg·g^-1）	馏程/℃			w（烃类组成）/%
项目	密度/ （g·cm^-3）	硫含量/ （μg·g^-1）	氮含量/ （μg·g^-1）	初馏点	50％回收温度	95％回收温度	链烷烃	环烷烃	总饱和烃	单环芳烃	双环芳烃	三环芳烃	总芳烃
常二柴油	0.825	801.7	4.8	169.0	247.6	356.2	49.3	33.8	83.1	14.0	2.8	0.1	16.9
常三柴油	0.852	1 065.8	50.4	205.0	335.0	394.2	43.3	28.8	72.1	17.9	8.7	1.3	27.9
加氢直馏柴油	0.827	＜5.0	＜1.0	163.7	238.8	349.5	40.8	45.0	85.8	13.8	0.4	0.0	14.2
加氢改质柴油	0.826	＜1.0	＜1.0	177.3	241.7	339.1	37.3	49.4	86.7	12.6	0.6	0.1	13.3
加氢催化柴油	0.901	＜1.0	＜1.0	168.5	255.6	364.2	13.9	19.3	33.2	62.6	4.0	0.2	66.8
加氢混合柴油	0.880	＜1.0	＜1.0	179.5	258.5	373.0	36.2	15.3	51.5	45.0	2.9	0.6	48.5

样品编号	样品质量/g	吸附质量/mg	吸附容量/（mg·g^-1）
1	1.376 8	307.9	223.63
2	1.461 0	323.2	221.22
3	1.425 0	319.6	224.28

项目	硫含量/ （μg·g^-1）	氮含量/ （μg·g^-1）	馏程/℃		回流比				剂油体积比	芳烃产品中芳烃纯度/%	非芳烃产品中非芳烃纯度/%
项目	硫含量/ （μg·g^-1）	氮含量/ （μg·g^-1）	初馏点	95%回收温度	吸附区	精制区	解吸区	隔离区	剂油体积比	芳烃产品中芳烃纯度/%	非芳烃产品中非芳烃纯度/%
常二线柴油	801.7	4.8	169.0	356.2	0.9	1.4	3.0	-1.8	1.85	95.7	98.1
常三线柴油	1 065.8	50.4	205.0	394.2	0.85	1.3	3.4	-1.8	2.18	95.4	97.1
加氢直馏柴油	＜5.0	＜1.0	163.7	349.5	0.88	1.4	3.0	-1.8	1.82	95.2	97.5

项目	w（芳烃）/%	回流比				剂油体积比	芳烃产品中芳烃纯度/%	非芳烃产品中非芳烃纯度/%
项目	w（芳烃）/%	吸附区	精制区	解吸区	隔离区	剂油体积比	芳烃产品中芳烃纯度/%	非芳烃产品中非芳烃纯度/%
加氢混合柴油	48.5	0.95	0.8	4.2	-1.6	2.98	96.3	96.4
加氢直馏柴油	14.2	0.88	1.4	3.0	-1.8	1.82	95.2	97.5
加氢催化柴油	66.8	1.1	0.4	5.6	-0.8	5.2	95.8	96.0

运行时间/d	芳烃产品中芳烃纯度/％	非芳烃产品中非芳烃纯度/％	运行时间/d	芳烃产品中芳烃纯度/％	非芳烃产品中非芳烃纯度/％
5	96.3	96.4	200	96.5	96.4
10	96.5	96.5	300	95.8	97.0
30	96.8	96.2	400	96.1	96.3
60	97.1	96.0	500	96.4	96.3
100	96.4	96.6	＞600	96.5	96.7
150	96.0	97.2

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on adsorption and separation performance of molecular sieve adsorbents for different types of diesel

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